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It is possible, but not necessary. A hexagon can have 0, 2, 3, 4, 5, or 6 parallel sides. A regular hexagon has 3 parallel sides.
It is necessary to know which of the five given measures refer to the trapezium [cross section] and which one is the length of the prism. Furthermore, it is necessary to know which two of the four sides of the trapezium are the parallel ones.It is necessary to know which of the five given measures refer to the trapezium [cross section] and which one is the length of the prism. Furthermore, it is necessary to know which two of the four sides of the trapezium are the parallel ones.It is necessary to know which of the five given measures refer to the trapezium [cross section] and which one is the length of the prism. Furthermore, it is necessary to know which two of the four sides of the trapezium are the parallel ones.It is necessary to know which of the five given measures refer to the trapezium [cross section] and which one is the length of the prism. Furthermore, it is necessary to know which two of the four sides of the trapezium are the parallel ones.
Parallel structure is not part of grammar, except to the extent that there are syntactic rules, like Conjunction Reduction, that apply to structures that are syntactically parallel. They're always optional rules, though, and there's no grammatical requirement to use parallel structures. They're awfully useful, though, as you point out -BrainQuiz
A parallelogram has 2 pairs of parallel sides, and provided that it isn't a square, it has no square corners. If necessary, you could call it an "oblique parallelogram" to indicate that it isn't square.
Yes, each pair of two opposite sides is parallel and equal in length. This is necessary to achieve the symmetry of the angles.